C15A air filter on carb too large

[Bob Carriere]

Hi Phil

I believe ALL W 1 carbs had a clamp style air breather like your cab 12...... I have never seen a W 1 carb with a center bolt....... now later Rochester carbs came with or without the centre long stem bolt...... most of the late 50 to early 60s Rochester where like that..... so maybe some one changed the air filter to match the after market carb.......

Will need to check the parts books with Grant.....

Comments anyone....?

Boob

[Bob Carriere]

Hi Phil

Early January 1941 shows only one model avaialble (cab11/12) 1525983.....
9" x 5 7/16

.late replaced by 1526795...listed in 1045 parts book.....same size as above...

....later replaced by 1543682..1 quart 8 3/4 x 6 11/32

....and of course two different type of Carter W 1 carbs.....
first type W -1 518S and 518SA

...second type.... called the "Dustproof Carb" W - 1 589S

Neither carbs are shown with a central long bolt that would hold the air filter.

Illustrations form the parts manual are useless as they were copies form civilian manuals with no attempt to show the military retro fit.....

More mysteries......

BooB

[Phil Waterman]

Hi Bob

Yup they kept making them better below are photos of W-1 with Dust Proof Top and Center bolt air cleaner hold down. My `45 HUP has one of these which I suspect is the original, little on that truck was changed. My `42 Pat 13 C60S also had one of these which is shown in picture, which might be a replacement.

In the picture with the other carbs you will note the rubber boot around the accelerator pump link, you will also note that it is no longer sealed to the top of the carb, unfortunately it didn't like the alcohol in the gas. The other two carbs are for a 261 and a 235/

I suspect that they went to the center bolt because it is a more secure way of holding the air cleaner on. Willing to bet that a lot of the clamp version were put back on and the clamps not tighten resulting in the air cleaners falling off spilling oil all over the manifold.

If any one is wondering why the maps as bench covers, every year I get a case of out of date maps from a friend.

Cheers Phil